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N0. 752,170. I PATENTED FEB. 16,1-904. P. W. KROGH. DEVICE FOR PROTECTING THE JOINTS BETWEEN STATIONARY AND MOVABLE MACHINERY.

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UNITED STATES Patented February 16, 1904.

FERDINAND W. KROGH, OF SAN FRANCISCO, CALIFORNIA.

DEVICE FOR PROTECTING THE JOlNTS BETWEEN STATIONARY AND MOVABLE MACHINERY.

SPECIFICATION formingpart of Letters Patent No. 752,170, dated February 16, 1904.

Application filed August 4, 1903.

' To all whom, it may concern.-

Be it known that I, FERDINAND W. KROGH, a citizen of the United States, residing at and in the city and county of San Francisco, State of California, have invented certain new and useful Improvements in Devices for Protecting the Joints between Stationary and Moving Machinery; and I do hereby declare the following to be a full, clear, and exact descrip- IO tion of said invention, such as will enable others skilled in the art to which it mostnearly appertains to make, use, and practice the same. My invention relates to an improved device for preventing sand and gravel from entering I 5 the joint between the stationary and moving parts of machinery and wearing away or grinding the surfaces of the joint, and it is especially adapted for protecting the joint that separates the stationary feed-spout of an ore-feeder from the surrounding movable part of an ore grinding or calcining mill.

Referring to the accompanying drawings, Figure 1 is a vertical section of a feed-hopper and its spout applied to one end of a rotary 2 5 mill. Fig. 2 is a vertical section of the spout,

showing the flange; and Fig. 3v is a short section of one of the flanges, showing the face construction of the flange.

Let A represent a rotary mill such as is 3 used either for grinding or calcining ore and other substances. The substance to be operated upon is dumped into a hopper B and is fed'forward through a spout G into the interior of the rotary mill. This spout passes through the end of the rotary mill and is stationary, and the opening in the end of the mill through which it passes fits close up and moves around this spout, so that a joint is formed between the parts. The ore or other 4 substance which is dumped into the hopper B and fed through spout G into the mill is liable to accumulate and pile up until it cov-.

- tering the joint.

Serial No. 168,234. (No model.)

ers the inner end of the spout, and when this happens the sand and fine particles are liable to enter the joint between the stationary and rotary parts of the machinery and grind away the surfaces of the joint. To remedy this difliculty, I make -the surrounding movable part of the joint e considerably larger in diameter than the diameter of the spout and form upon it or attach to it spirally-arranged flanges f, so as to move next to the stationary spout C, and thereby serve as the moving face of the joint. These flanges should be made so as to fit close to the exterior of the spout and by their arrangement act like the spiral flanges on a conveyor to force the material constantly away from the joint into the interior of the mill and prevent it from en- The number of these flanges is immaterial, and they may be wider or narrower, as desired; but usually I make the outer face narrow by beveling the edges, as shown at Fig. 3.

I thus provide a protection for this class of joints by which trouble and expense is avoided and the unearthly screeching and consequent wearing of the joints avoided.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, isj The improvement in protecting joints between stationary and moving machinery of the class described, consisting in securing to the moving surface of the joint a spiral flange or flanges whereby the ore and sand are prevented from entering between the surfaces of the joint, substantially as described.

In witness whereof Ihave signed my name.

FERDINAND W. KROGH.

Witnesses:

G. A. Knoen, LEON BOILLOT. 

